Fixed is_nan to fetch only the is_nan values.
Fixed is_nan to fetch only the is_nan values.

wnyc/crab,hi2srihari/crab,augustoppimenta/crab,echogreens/crab,muricoca/crab,muricoca/crab,Lawrence-Liu/crab,rcarmo/crab,wnyc/crab,Flowerowl/Crab,imouren/crab